Program Example Of Timebase Timer - Fujitsu MB90895 Series Hardware Manual

5.7

Program Example of Timebase Timer

Programming examples for the timebase timer are shown below.
Program Example of Timebase Timer
Processing specification
12
The 2 /HCLK (HCLK: oscillation clock) interval interrupt is generated repeatedly.In this case, the interval
time is approximately 1.0 ms (at 4-MHz operation).
Coding example
ICR02 EQU
TBTC EQU
TBOF EQU
TBIE EQU
;-------Main program---------------------------------------
CODE CSEG
START:
AND
MOV
MOV
SETB
MOV
OR
LOOP: MOV
MOV
BRA
;-------Interrupt program------------------------------------
WARI:
CLRB
CLRB
.
User processing
.
SETB
RETI
CODE ENDS
;-------Vector setting----------------------------------------
VECT CSEG
ORG
DSL
ORG
DSL
DB
VECT ENDS
END
0000B2H ;Time base timer interrupt control register
0000A9H ;Time base timer control register
TBTC:3 ;Interrupt rquest flag bit
TBTC:2 ;Interrupt enable bit
;Stack pointer(SP),already initialized
CCR,#0BFH ;Interrupt disable
I:ICR02 #00H ;Interrupt level 0(highest)
I:TBTC,#10000000B
;Upper 3 bis are fixed
;TBOF clear,
;Counter clear interval time
12
;2
I:TBIE ;Interrupt enable
ILM,#07H ;Setting ILM in PS to level 7
CCR,#40H ;Interrupt enable
A,#00H ;No limit roop
A,#01H
LOOP
I:TBIE ;Clear interrupt enable bit
I:TBOF ;Clear interrupt request flag
I:TBIE ;Interrupt enable
;Recovery from interrupt processing
ABS=0FFH
0FFBCH ;Vector setting to interrupt number #16(10
WARI
0FFDCH ;Reset bector setting
START
00H ;Setting to single chip mode
START
/HCLK selection
CHAPTER 5 Timebase timer
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